Method of briquetting coal

FIELD: briquetting brown coal in regions remote from consumer.

SUBSTANCE: proposed method includes grinding the coal, heat treatment, mixing with binder and molding. Coal is mixed with binder at pyrolysis of coal fines and "chocolate"-shaped plates are molded in between polymer films.

EFFECT: reduced wear of briquettes in transit; reduced consumption of binder.

 

The invention relates to the coal industry, and more particularly to a method of briquetting coal, mostly brown, in regions remote from consumers.

There is a method of briquetting coal without a binder, comprising the grinding of coal, drying and pressing it on the stamp press (Vincken "Features briquetting of lignite Chatskogo field. - In the book. Briquetting of coal and carbonaceous materials. - M.: Nedra, 1973, - p.10-11, figure 3.).

The disadvantage of this method is high (>100 MPa) pressure, and great wear expensive pressing equipment, limited coal feedstock to obtain without binder conforming briquettes and significant wear briquette mass during long-distance transportation.

There is a method of briquetting of lignite, including heat treatment of fine coal, mixing with a binder and pressing briquettes (Sharmanov, Gakenov "Briquetting of lignite coal Kyrgyzstan with cotton tar", solid state Chemistry, 1992, No. 6, p.87-88).

The disadvantage of this method is the significant depreciation of the produced briquettes during transportation over long distances due to the friction surface of many briquettes together with the filling, the vibrations on the road and handling, as well as increased consumption of a binder by n is scoi temperature mixing and large surface area is relatively small briquetted coal.

The technical effect of the invention is to reduce wear of coal during loading, transport, handling and unloading at the reduced flow of the binder.

This goal is achieved as follows. The whole wide coal fraction, for example from 0 to 30÷50 mm, obtained by grinding in a crusher, thermoablative to the development of pyrolytic processes in coal and then mixed with a binder such as bitumen or tar, which use a rotating tube furnace and the feeder in her binder serial equipment asphalt plant (SP). From the obtained coal "asphalt" pressing form a "chocolate"-shaped plate of large size, such as 2×1×0.1 m with the "bricks" in the cells of 0.2×0.1 m, and the carbon plate is pressed between thin polymer, for example polyethylene films. As the press uses smooth and finned metal plate, compressible hydraulic unit pressure below 5 MPa.

Transportation compact package coal stoves with attached polymer coating even at long distances virtually eliminates wear due to friction of the coal surfaces together that takes place during the transportation and handling of "nuts" and other small briquettes vaalco.

Pyrolytic processes during thermal treatment of coal ways is owing to condensation of tarry substances from decay of small particles on the surface of the medium and large pieces. Small specific surface area of the latter, the chemical affinity resins with coal and a binder having good wettability at high temperatures, reduce the amount of binder is below 5% and to increase the adhesion strength during pressing. Moreover, the pyrolysis oxidation of coal reduces heat costs on the combustion of fuel in the injector tube furnace and high temperature drying intensifies the main mass (medium and large pieces), which increases the calorific value of briquettes.

The treatment mode is chosen from the condition does not fire coal "asphalt" when unloading, when the pressing has a temperature of about 150°that provides a "sticking" of the polymer film to the coal without sticking it to the relatively cold forming plates. Polymer film except exception of the wear and tear of coal during transportation provides moisture and usadatanet briquettes, and also simplifies the removal of the coal plate of the pressing device.

The integrated use of equipment serial PARA enables cost-effective low-tonnage production of coal plates, batch shipping them to the consumer with little or no loss, while the production of traditional small briquettes is economically justified when the big performance, and delivery of products include the and with the reduction of qualitative and quantitative indicators.

The method is tested on the fraction 0÷10 mm brown coal Kangalassky field, Republic of Sakha (Yakutia) with bitumen binder at a concentration of less than 5% when pressing under a pressure of about 5 MPa and a temperature of ˜150°C. Received "chocolate"-shaped tiles in the sizes 25×12×2 cm and a cell 3×3 cm well withstand the vibration, and when the blow and dropping discharged only "bricks", as provided for in the result for the consumer.

These features of the invention are its differences from the prototype and determine the novelty of the proposal. These differences are significant because they enable the creation of a positive effect, reflected in the objectives of the proposal, and there are no known technical solutions with the same effect.

Method of briquetting coal, including heat treatment of fine coal, mixing with a binder and pressing, characterized in that all the coal after crushing is mixed with a binder in the process of pyrolysis of coal dust and pressed "chocolate"-shaped plate between the polymer films.



 

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